Variables associated with the post-treatment healing of lesions in patients with American cutaneous leishmaniasis in Paraná State, Brazil
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1 Brazilian Journal of Pharmaceutical Sciences vol. 45, n. 4, oct./dec., 2009 Article Variables associated with the post-treatment healing of lesions in patients with American cutaneous leishmaniasis in Paraná State, Brazil Maria Teresinha Gomes Casavechia 1, Thaís Gomes Verzignassi Silveira 1, Ueslei Teodoro 2, Vanderly Janeiro 1, Margareth Udo 3, Maria Valdrinez Campana Lonardoni 2 * Health Sciences Center, Maringá State University, 2 Department of Clinical Analysis, Health Sciences Center, Maringá State University, 3 Department of Statistics, Exact Sciences Center, Maringá State University. The purpose of this study was to investigate the relationship of several variables to the healing of lesions in patients with American cutaneous leishmaniasis (ACL). The patients with clinical and/or laboratorial diagnoses of the disease were followed up for varying periods after treatment by clinical evaluation and indirect immunofluorescence assay (IFA), from September 2000 to December The lesions of 85.3% of the 163 patients had healed by their last return for clinical evaluation, and of these, 82.7% had negative IFA results, indicating an association between the healing of lesions and IFA negativity (p=0.000). In patients evaluated up to 120 days after treatment, there was a significant association between negative IFA results and the healing of lesions (p=0.0000). Logistic regression analysis showed that negative IFA results on patients first return after treatment predicted a fold greater chance of lesion healing (p=0.0001). These results indicate an association between IFA negativity at the first return up to a period of 120 days, and the healing of lesions, and that the chances of healing are significantly higher in patients with negative IFA results at their first return after treatment. Uniterms: Cutaneous leishmaniasis/treatment. Leishmania (Viannia) braziliensis. Cutaneous lesion/ healing. O objetivo deste estudo foi investigar a associação de algumas variáveis para a cicatrização de lesões em pacientes com leishmaniose tegumentar americana (LTA). Os pacientes com diagnóstico clínico e laboratorial foram acompanhados depois do tratamento por avaliação clínica e reação de imunofluorescência indireta (IFI), de setembro de 2000 a dezembro de Dos 163 pacientes 85,3% apresentaram cicatrização das lesões no último retorno para a avaliação clínica e 82,7% destes tiveram a IFI negativa indicando uma associação entre a cicatrização das lesões e a negativação da IFI (p=0,000). Nos pacientes acompanhados até 120 dias depois do tratamento houve associação significativa entre os resultados negativos da IFI e a cicatrização das lesões (p=0,0000). A análise pela regressão logística mostrou que quando a IFI do primeiro retorno após o tratamento foi negativa, o paciente tinha 2,175 mais chance de cicatrização (p=0,0001). Os resultados mostram associação entre a negativação da IFI e a cicatrização das lesões quando o primeiro retorno foi até 120 dias e que as chances de cicatrização são significativamente maiores nos pacientes que apresentaram IFI negativa no primeiro retorno depois do tratamento. Unitermos: Leishmaniose cutânea/tratamento. Leishmania (Viannia) braziliensis. Lesão cutânea/ cicatrização. INTRODUCTION *Correspondence: M. V. C. Lonardoni. Department of Clinical Analysis, Health Sciences Center, Maringá State University, Avenida Colombo 5790, Maringá - PR, Brazil. mvclonardoni@uem.br American cutaneous leishmaniasis (ACL) is an endemic disease in Brazil, occurring in every state in the country. It affects people of both sexes and all age groups. The main species of sand flies that cause ACL in Brazil are Leishmania (Viannia) braziliensis (Vianna, 1911), Leishmania (Viannia) guyanensis (Floch, 1954) and Leishmania (Leishmania) amazonensis (Lainson, Shaw, 1972) (Brasil, 2000).
2 842 M. T. G. Casavechia, T. G. V. Silveira, U. Teodoro, V. Janeiro, M. Udo, M. V. C. Lonardoni ACL has been recorded in the majority of cities in the state of Paraná (Roberto et al., 1997; Silveira et al., 1999; Lima et al., 2002), which accounts for 98% of cases in the southern region of Brazil (Brasil, 2000). The success of ACL treatment is limited. The clinical control of treatment is imprecise, and relapses, even after complete treatment and healing of the initial lesions, have been documented (Guevara et al., 1993). The first-choice drug in Brazil for treating ACL is N-methyl glucamine antimoniate (Glucantime ). According to the World Health Organization (WHO, 1995), more than 90% of relapses occur within one year of treatment. Furthermore, the mucosal form may occur among these patients, generally appearing months or even years after the resolution of the skin lesions. Antibodies detected by indirect immunofluorescence assay (IFA) are negative after successful treatment of the disease (Furtado, 1980; Souza et al., 1982). The presence of anti-leishmania antibodies after treatment may signify the persistence of the parasite, and the reduction of antibody titers has been suggested as a tool for the control of treatment efficacy (Chiari, Mayrink, Magalhães, 1973; Mendonça et al., 1988). Therefore, the following-up of patients by clinical and serological evaluation is fundamental (Roberto et al., 1997). The objective of this research was to study the possible association of the variables sex, IFA at initial diagnosis, IFA at first return, IFA at different post-treatment periods and IFA at last return for clinical evaluation for the healing of lesions in ACL patients. To this end, a group of ACL patients were followed-up for varying periods after clinical and laboratorial diagnosis, after which the contribution of each variable was analyzed. MATERIAL AND METHODS Patients One hundred and sixty-three ACL patients, registered in the 13 th Health Region of Cianorte, in northwest Paraná from September, 2000 to December, 2003 were selected. Treatment was prescribed for all patients after positive clinical and/or laboratorial diagnoses. All patients were instructed to return for clinical evaluation and collection of blood samples for the IFA. The follow-up period of the patients varied from 22 to 696 days from the start of treatment, with all patients being evaluated at least once after treatment. The total number of evaluations (including initial diagnosis and subsequent returns) varied from two to five for each patient. Laboratorial diagnosis The laboratorial tests for ACL used in this study were Direct Parasite Search (DPS), Montenegro Skin Test (MST), and Indirect Immunofluorescence Assay (IFA). In the DPS, lesion samples were collected by scraping. Smears were made on glass slides, stained by Giemsa, and examined by microscope for the presence of amastigote forms. The MST reagent consisted of Leishmania (L.) amazonensis promastigotes containing 40 µg/ml of protein nitrogen, kindly supplied by the Immunobiological Production and Research Center of the Paraná State Health Office. The test was considered positive when an induration diameter greater than or equal to 5mm was observed 48 hours after inoculation. The IFA for IgG was carried out using promastigote forms of Leishmania (V.) braziliensis. The serum was diluted, beginning at 1/20. Samples with titers equal to or greater than 40 were considered positive (Silveira et al., 1999). Treatment protocol The patients were intravenously treated with N-methyl glucamine antimoniate at 15 mg Sb 5+ /kg per day (Brasil, 2000). Five patients did not respond to this treatment protocol. Therefore, three of these non-responders were also treated with Pentamidine (pentamidine isothiocyanate), one with Pentamidine and intralesional infiltration with pentavalent antimonial, and one with intralesional infiltration only. The patients were considered clinically cured after complete healing of their lesions. Ethical issues This study complied with Resolution No. 196/96 of the National Health Council of the Brazilian Ministry of Health, and was approved by the Permanent Committee for Ethics in Research Involving Humans of the State University of Maringá (No. 006/2004). Statistical analysis An exploratory analysis of the data was carried out and Fisher s exact test was used to verify the associations. Logistic regression was used to verify which variables contributed significantly to the healing of the lesions, using the patients first return for clinical and serological evaluation as a parameter. The statistical analyses were carried out with the software SAS 8.02 (Statistical Analyses System) using the logistic procedure PROC LOGISTIC with the stepwise selection to determine which variables
3 Variables associated with the post-treatment healing of lesions 843 contributed to healing. Variables were considered significant at the 5% significance level. The following variables were considered in the logistic regression model: sex, age, IFA at initial diagnosis (IFA_ini), IFA at first return (IFA_ret) and the number of days until the first return (days). The dependent variable was lesion healing by first return (Cret). The following categorizations were used: sex: 1 for male and 1 for female; IFA_ini: 1 if negative and 1 if positive; IFA_ret: 1 if negative and 1 if positive; days: 1 if the first return occurred within a maximum of 120 days and 1 if the first return occurred after 120 days; Cret: 1 if healed and 0 if not healed. The results found through the statistical analysis showed that the age variable was not significant for the model (p=0.7507). Therefore, the adjusted model was given as: where: b 0 = , b 1 = , b 2 = , b 3 = and b 4 = RESULTS Of the 163 cases of ACL studied, 127 (77.9%) were male and 36 (22.1%) female. Patient age ranged between 2 and 79 years (median = 33 years), 8.6% were aged up to 15 years and 6.8% were over 65. All the patients had cutaneous forms of ACL. One hundred and ten patients (67.5%) had a single lesion, 31 (19.0%) had two lesions and 12 (7.4%) had three or more. It was not possible to obtain this information for 10 patients. Two patients had negative DPS results, with IFA and MST not being carried out, and were included in the sample due to their clinical diagnoses. Table 1 shows that the laboratorial diagnoses of 161 (98.8%) patients were positive for ACL on at least one of the methods used. The DPS was positive in 101 of the 160 patients submitted to the examination (63.1%), while the MST was positive in 134 out of 144 patients (93.1%), and the IFA positive in 141 out of 163 patients (86.5%). The diagnosis was confirmed by all three laboratorial methods in 75 (46.0%) patients. Of the 62 patients with negative results on the DPS, or who were not submitted to the DPS, 40 (64.5%) had positive IFA and MST results, 12 (19.4%) had positive MST results only and 8 (12.9%) had positive IFA results only. In the follow-up of the 163 patients, 139 (85.3%) showed the healing of lesions by their last return for clinical evaluation (Table II). In 115 (82.7%) of these patients, IFA was negative, indicating an association between the healing of lesions and the negativity of IFA (p=0.000). However, 24 patients (17.3%) continued to have positive IFA results despite having healed lesions. Of the 24 patients that did not show healing of lesions, 17 (70.8%) continued to have positive IFA results. TABLE I - Results of direct parasite search (DPS), Montenegro skin test (MST) and indirect immunofluorescence assay (IFA), carried out in the diagnosis of American cutaneous leishmaniasis (ACL) in the 163 patients studied from 2000 to 2003 DPS Positive (n=101) Negative (n=59) NP (n=3) MST Positive IFA Negative Total Positive Negative NP Positive Negative NP Positive Negative NP Total NP=Not Performed TABLE II - Results on indirect immunofluorescence assay (IFA) and of lesion healing in the 163 patients with American cutaneous leishmaniasis (ACL) at last return for clinical evaluation during post-treatment follow-up from 2000 to 2003 Healed IFA Total Negative Positive Yes No Total Fisher s exact test, p= Table III shows the results of the clinical and serologic evaluations of the followed-up patients. Of the 81 evaluations performed within 120 days of treatment, 51 patients (63.0%) showed healing of lesions, 41 of whom (80.2%) had negative IFA results. Thirty patients (37.0%) showed no healing of lesions, six of whom (20.0%) had negative IFA results. A significant association (p=0.0000) was observed between IFA negativity and the healing of lesions within this evaluation period. Of the 78 patients followed-up from 121 to 210 days, 57 (73.1%) showed
4 844 M. T. G. Casavechia, T. G. V. Silveira, U. Teodoro, V. Janeiro, M. Udo, M. V. C. Lonardoni healing of lesions while 42 (73.7%) had a negative IFA. Twenty-one (26.9%) patients from this group showed no healing of lesions, nine of whom (42.9%) had a negative IFA (p=0.0552). Of the 51 patients followed-up from 211 TABLE III - Results on indirect immunofluorescence assay (IFA) and for lesion healing in the 163 patients with American cutaneous leishmaniasis (ACL) during different post-treatment periods from 2000 to 2003 Time (days) Healed IFA Total p Negative Positive 120 Yes No Sub Total to 210 Yes No Sub Total to 365 Yes No Sub Total > 365 Yes No Sub Total Total * *After initial diagnosis, 114 patients returned once, 42 twice, 5 three times, 1 four times and 1 five times, amounting to a total of 222 blood samples subjected to IFA; p: value of Fisher s exact test: IFA versus healing. to 365 days, 41 (80.4%) showed healing of lesions, and of these 30 (73.2%) had a negative IFA. Ten (19.6%) of these patients showed no healing of lesions and four (40.0%) had a negative IFA (p=0.0552). Finally, of the twelve patients followed-up after 365 days, ten (83.3%) showed healing of lesions, five of whom (50.0%) had a negative IFA. Two (20.0%) patients from this group presented no healing of lesions and showed IFA positivity (p=0.3182). The results of clinical and serologic evaluations performed during other periods (121 to 210 days, 211 to 365 days, and over 365 days) were also analyzed. However, no significant associations between IFA negativity and the healing of lesions were observed for these periods (p>0.05). As a significant association (p=0.0000) was observed between IFA negativity and the healing of lesions in the period up to 120 days, logistic regression was performed on the data from this period to analyze the possible factors associated to lesion healing. It was observed that patients who had a negative IFA on their first return after treatment had a greater likelihood of their lesions healing than when IFA was positive (p=0.0001; CI= ) (Table IV). Analysis of other factors such as gender, IFA result at initial diagnosis, and time of first return after treatment (up to 120 days or after 120 days) found no associations with lesion healing (p>0.05). DISCUSSION The majority of the patients studied were from the male working-class population, suggesting an extra-domi- TABLE IV - Logistic regression analysis of factors associated with healing of lesions in 163 patients with American cutaneous leishmaniasis (ACL), followed-up from 2000 to 2003 Variables Gender Yes Healed No Odds Ratio (95% confidence interval) Male Female 31 5 ( ) IFA on initial diagnosis Positive Negative 20 2 ( ) IFA on First Return$(within 120 days) Positive Negative ( ) Time of First Return Within 120 days >120 days ( ) Chi-squared p
5 Variables associated with the post-treatment healing of lesions 845 ciliary transmission of ACL, as was previously observed in the north of the state of Paraná (Silveira et al., 1999; Castro et al., 2002). However, the occurrence of cases in the age ranges of up to 15 and over 65 years, for both sexes, also suggests intra- or peri-domiciliary transmission occurred, corroborating data from the north of Paraná State (Roberto et al., 1997; Lima et al., 2002) and on an endemic area of the State of Minas Gerais, Brazil (Passos et al., 2001). In the present study, IFA showed a higher rate of positivity than the MST or DPS in the diagnosis of ACL, contrasting with results obtained by Silveira et al. (1999), who found higher positivity for the MST in patients from the same geographical area. The sensitivity of IFA in the present study was similar to that found in studies on other endemic areas (Marzochi et al., 1980; Lugo de Yarbuh et al., 1996). Together, the three methods used for ACL diagnosis were able to detect 98.8% of the ACL cases, showing it to be a useful combination for diagnosing the disease (Gontijo, Carvalho, 2003). A highly significant association between the healing of lesions and negative IFA results was observed in this study, confirming that successful treatment reduces levels of anti-leishmania antibodies (Amato et al., 1998). Romero et al. (2005) also observed a reduction in antibody levels on enzyme-linked immunosorbent assay (ELISA) post treatment. Therefore, the reduction of anti-leishmania antibody levels after treatment could be an important tool in the control of ACL treatment (Mendonça et al., 1988). The data for different post-treatment periods was analyzed in order to identify the optimal time after treatment to evaluate the association between the healing of lesions and IFA seroconversion. The analysis showed that lesion healing was associated to negative IFA results when the evaluation was carried out in the period of up to 120 days after treatment. According to Passos et al. (2001), the treatment and elimination of the parasites induces lower antigenic stimulation, which contributes to IFA negativity, and Saravia et al. (1989) showed that there was an association between longer lesion evolution time and higher IFA titers in patients infected with L. braziliensis. In the present study, a tendency of IFA negativity seen among those patients whose lesions had healed and who were analyzed during the periods of 121 to 210 and 211 to 365 days after treatment (p=0.0552). However, no association was observed between IFA negativity and the healing of lesions in those patients evaluated 365 days or more after treatment. This suggests that patients who continue to have antibody titers show a tendency to evolve to the chronic disease, or the reappearance of cutaneous and/or mucosal lesions. Attention is drawn to the group of patients (17.3%) whose lesions healed but for whom IFA results remained positive. The persistence of antibodies may be an important indicator of the persistence of the parasite, despite the healing of their lesions. Indeed the persistence of the parasite in healed lesions was demonstrated by Mendonça et al. (2004). These authors obtained 30 positive PCR and 7 positive IFA results from 32 clinically cured patients, indicating the tendency of Leishmania to establish nonapparent infections (Ramirez, Guevara, 1997). Chiari et al. (1973) found that 38% of patients submitted to treatment, and considered clinically cured, continued to have positive IFA results. Passos et al. (2001) did not associate the risk of recurrence to antibody levels measured by IFA; however, Amato et al. (1998) argued that the negativity of IFA antibody titers indicates a lower possibility of recurrence. These observations suggest that a more rigorous following-up of ACL patients, as well as their medicinal dosage and treatment protocol, through clinical and laboratory evaluations, is necessary. Of the patients whose lesions did not heal, IFA results remained positive for 80.0% and 57.1% during the periods of up to 120 days and from 121 to 210 days, respectively, showing the failure of the treatment. Different degrees of susceptibility to treatment, as well as different levels of immunological response, have been related to the various serodemes (Shaw et al., 1986) of Leishmania (Viannia) braziliensis that circulate in the northwest region of Paraná State (Silveira et al., 1999). While some infections by Leishmania present complications during treatment, sometimes producing metastasis and recurrence, others evolve to a spontaneous cure, suggesting that the immunological response is capable of controlling the infection (Brito et al., 2001). In the present study, it was shown that the chances of lesions healing are greater if the IFA performed is negative when the patient first return after treatment. This indicates that both the initial diagnosis and the start of treatment were probably early. Neither IFA positivity at initial diagnosis, nor the time of the first return for evaluation of treatment, were found to be factors associated with the healing of lesions. No differences in lesion healing between men and women were found, despite the findings of Travi et al. (2002), who studied hamsters infected with Leishmania (Viannia) and observed that the immune response was more permissive to infection among males than females. The factors that contribute to the cutaneous disease evolving into one of the later forms are not fully understood, but delay in healing the first lesion and inadequate treatment are both known predictors (Carvalho et al., 1995).
6 846 M. T. G. Casavechia, T. G. V. Silveira, U. Teodoro, V. Janeiro, M. Udo, M. V. C. Lonardoni CONCLUSIONS The findings of this study confirm that: a) there is an association between IFA negativity at the first return of the patient within 120 days of treatment and the healing of lesions, and b) the chances of healing are significantly higher in patients that showed negative IFA results on their first return for clinical evaluation after treatment. ACKNOWLEDGEMENTS This research work was financially supported by the Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq) and by the Laboratory of Teaching and Research in Clinical Analysis (LEPAC) of the State University of Maringá. REFERENCES AMATO, V. S.; DUARTE, M. I. S.; NICODEMO, A. C.; CARVALHO, L. V.; PAGLIARI, C.; MATTA, V. L. R.; OLIVEIRA, L. S.; CASTRO, S. M.; UIP, D. E.; AMATO, J. G. P.; AMATO-NETO, V. An evaluation of clinical, serologic, anatomopathologic and immunohistochemical findings for fifteen patients with mucosal leishmaniasis before and after treatment. Rev. Inst. Med. Trop., v.40, n.1, p.23-30, BRASIL, Ministério da Saúde. Manual de controle da leishmaniose tegumentar americana. Brasília: Assessoria de Comunicação e Educação em Saúde, Fundação Nacional de Saúde, p. BRITO, M. E. F.; MENDONÇA, M. G.; GOMES, Y. M.; JARDIM, M. L.; ABATH, F. G. C. Dynamics of the antibody response in patients with therapeutic or spontaneous cure of American cutaneous leishmaniasis. Trans. R. Soc. Trop. Med. Hyg., v.95, n.2, p , CARVALHO, E. M.; CORREA-FILHO, D.; BARCELAR, O.; ALMEIDA, R. P.; LESS, H.; ROCHA, H. Characterization of the immune response in subjects with self-healing cutaneous leishmaniasis. Am. J. Trop. Med. Hyg., v.53, n.3, p , CASTRO, E. A.; SOCCOL, V. T.; MEMBRIVE, N.; LUZ, E. Estudo das características epidemiológicas e clínicas de 332 casos de leishmaniose tegumentar notificados na região norte do Estado do Paraná de 1993 a Rev. Soc. Bras. Med. Trop., v.35, n.5, p , CHIARI, C. A.; MAYRINK, W.; MAGALHÃES, P. A. Reação de imunofluorescência indireta no controle do tratamento da leishmaniose tegumentar americana. Rev. Soc. Bras. Med. Trop., v.15, n.5, p , FURTADO, T. Critérios para o diagnóstico da leishmaniose tegumentar americana. An. Bras. Dermatol., v.55, n.2, p.81-86, GONTIJO, B.; CARVALHO, M. L. R. Leishmaniose tegumentar americana. Rev. Soc. Bras. Med. Trop., v.36, n.1, p.71-80, GUEVARA, P.; RAMÍREZ, J. L.; ROJAS, E.; SCORZA, J. V.; GONZÁLEZ, N.; AÑEZ, N. Leishmania braziliensis in blood 30 years after cure. Lancet, v.341, n.8856, p.1341, LIMA, A. P.; MINELLI, L.; TEODORO, U.; COMUNELLO, E. Distribuição da leishmaniose tegumentar por imagens de sensoreamento remoto orbital, no Estado do Paraná, Brasil. An. Bras. Dermatol., v.77, n.6, p , LUGO DE YARBUH, A.; AÑEZ, N.; VALERA, M.; MORENO, E. Deteccion de titulos de anticuerpos, proteínas totales, albumina y globulinas em casos de leishmaniosis cutânea tratados com Glucantime. Parasitol. Dia, v.20, n.1, p.20-26, MARZOCHI, M. C. A.; COUTINHO, S. G.; SABROSA, P. C.; SOUZA, W. J. S. Reação de imunofluorescência indireta e intradermorreação para leishmaniose tegumentar americana em moradores na área de Jacarepaguá (Rio de Janeiro): estudo comparativo dos resultados observados em 1974 e Rev. Inst. Med. Trop. São Paulo, v.22, n.3, , MENDONÇA, M. G.; BRITO, M. E. F.; RODRIGUES, E. H. G.; BANDEIRA, V.; JARDIM, M. L.; ABATH, F. G. C. Persistence of Leishmania parasites in scars after clinical cure of American cutaneous leishmaniasis: is there a sterile cure? J. Infect. Dis., v.189, n.6, p , MENDONÇA, S. C. F.; SOUZA, W. J. S.; NUNES, M. P.; MARZOCHI, M. C. A.; COUTINHO, S. G. Indirect immunofluorescence test in New World leishmaniasis: serological and clinical relationship. Mem. Inst. Oswaldo Cruz, v.83, n.3, p , 1988.
7 Variables associated with the post-treatment healing of lesions 847 PASSOS, V. M. A.; BARRETO, S. M.; ROMANHA, A. J.; KRETTLI, A. U.; VOLPINI, A. C.; GONTIJO, C. M. F.; FALCÃO, A. L.; LIMA-COSTA, M. F. F. Leishmaniose tegumentar na Região Metropolitana de Belo Horizonte: aspectos clínicos, laboratoriais, terapêuticos e evolutivos ( ). Rev. Soc. Bras. Med. Trop., v.34, n.1 p.5-12, RAMÍREZ, J. L.; GUEVARA, P. Persistent infections by Leishmania (Viannia) braziliensis. Mem. Inst. Oswaldo Cruz, v.92, n.3, p , ROBERTO, A. C. B. S.; LIMA, A. P.; PEIXOTO, P. R.; MISUTA, N. M.; FUKUSHIGUE, Y.; FERREIRA, M. E. M. C.; NERILO-SOBRINHO, A.; SILVEIRA, T. G. V.; TEODORO, U. Avaliação da terapia com antimoniato de N-metil-glucamina e de notificação de leishmaniose tegumentar. An. Bras. Dermatol., v.72, n.2, p , ROMERO, G. A. S.; ORGE, M. G. O.; GUERRA, M. V. F.; PAES, M. G.; MACEDO, V. O.; CARVALHO, E. M. Antibody response in patients with cutaneous leishmaniasis infected by Leishmania (Viannia) braziliensis or Leishmania (Viannia) guyanensis in Brazil. Acta Tropica, v.93, n.1, p.49-56, SARAVIA, N. G.; VALDERRAMA, L.; LABRADA, M.; HOLGUÍN, A. F.; NAVAS, C.; PALMA, G.; WEIGLE, K. A. The relationship of Leishmania braziliensis subspecies and immune response to disease expression in New World Leishmaniasis. J. Infect. Dis., v.159, n.4, p , SHAW, J. J.; LAINSON, R.; McMAHON-PRATT, D.; DAVID, J. R. Serodemes of the Leishmania braziliensis complex. In: RIOUX, J. (Ed.). Leishmania taxonomie et phylogenèse: applications Éco-épidémiologiques: Colloque International, 2-6 july, Montpellier, Montpellier: IMEE, p SILVEIRA, T. G. V.; ARRAES, S. M. A. A.; BERTOLINI, D. A.; TEODORO, U.; LONARDONI, M. V. C.; ROBERTO, A. C. B. S.; RAMOS, M.; NERILO-SOBRINHO, A.; ISHIKAWA, E.; SHAW J. Observações sobre o diagnóstico laboratorial e a epidemiologia da leishmaniose tegumentar no Estado do Paraná, sul do Brasil. Rev. Soc. Bras. Med. Trop., v.32, n.4, p , SOUZA, W. J. S.; COUTINHO, S. G.; MARZOCHI, M. C. A.; TOLEDO, L. M.; GOTTLIEB, M. V. Utilização da reação de imunofluorescência indireta no acompanhamento da terapêutica da leishmaniose tegumentar americana. Mem. Inst. Oswaldo Cruz, v.77, n.3, p , TRAVI, B. L.; OSÓRIO, Y.; MELBY, P. C.; CHANDRASEKAR, B.; ARTEAGA, L.; SARAVIA, N. G. Gender is a major determinant of the clinical evolution and immune response in hamsters infected with Leishmania spp. Infect. Immun., v.70, n.5, p , WORLD HEALTH ORGANIZATION. Control of Leishmaniasis. Geneva: WHO, (Technical Report Series, n.793). Received for publication on 09 th December Accepted for publication on 05 th June 2009.
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